Key Takeaways
- A pre-season soundness check is proactive performance management, not a vet visit for a horse that is already in trouble.
- Osteoarthritis is estimated to account for up to 60% of lameness in horses, and it develops gradually, so joint changes are usually present before a horse looks lame.
- Six checks you can run yourself, plus the red flags that justify a vet call rather than another fortnight of watching.
- If joint involvement is found early, there are treatment options that fit inside a pre-season programme rather than interrupting it.
The horse that gets scratched in November is often the horse that felt a fraction off in August. Not lame. Just a little short on one rein, sticky out of the box on cold mornings, half a length behind where it should have been in a piece of work.
This guide is written for trainers running sport horse or racing stables in New Zealand. It covers a pre-season soundness check you can carry out yourself, the signs that warrant a vet call, and what your options look like if a joint turns out to be involved.
Why Do Pre-Season Soundness Checks Matter for Performance Horses?
Pre-season soundness checks matter because they buy you time. A joint problem picked up eight weeks out can usually be worked around inside your programme. The same problem found mid-campaign costs competition starts, and by then the list of things you can do about it has shortened.
A lameness exam is something you book because a horse is already in trouble. A pre-season check is a scheduled look over a horse that appears fine, done specifically to find what is not yet obvious. That matters because joint disease does not arrive overnight. Osteoarthritis is estimated to account for up to 60% of lameness in horses, and it is progressive, developing through repeated cycles of inflammation inside the joint well before a horse presents as clearly lame. Inflammation of the synovial membrane, the soft tissue lining the joint, usually comes first. By the time a horse nods, the process has been running for some time.
Risk tracks workload more closely than breed. Thoroughbreds, Standardbreds and Warmbloods are the horses most often treated for joint lameness in New Zealand, but that largely reflects what they are asked to do: repeated high-speed loading, tight turns, and hard or variable ground.
Your role here is not diagnosis. It is observation and flag-raising. You see these horses every day, which puts you in a better position than anyone to notice the half-stride that was not there last month. Working out the cause is the vet’s job.
What Should Trainers Check Before the Season Starts?
A pre-season soundness check covers six things: movement quality, joint palpation, flexion response, muscle symmetry, behaviour under work, and the hoof and lower limb. All six can be assessed by a trainer before a vet is involved.
What is a pre-season soundness check? A pre-season soundness check is a structured, hands-on assessment of a horse that is not currently lame, carried out before the workload increases. It is pre-emptive rather than reactive. The purpose is to find early changes while there is still time to act on them.
Work through all six on every horse and write down what you find. A note you can compare against next month is worth more than an impression you half-remember.
- Movement. Walk and trot the horse on a hard, level surface, away and back, then on a circle both directions. Look for shortness of stride, a head nod, irregular rhythm, or reluctance to track up. Use the same surface each time so the comparison holds.
- Joint palpation. Run your hands down each limb before work, while the horse is cold, comparing left to right at fetlock, knee, hock and coronary band. You are feeling for heat, filling, and joint effusion, which is excess fluid inside the joint capsule felt as a soft, fluctuating swelling.
- Flexion response. Hold and flex each limb, noting resistance, a pain response, or a horse that will not tolerate the hold. This is not a formal flexion test. You are recording a reaction for the vet to follow up properly.
- Symmetry. Stand behind and in front and look at the hindquarters, shoulders and topline. Asymmetric muscle usually means the horse has been loading one side more than the other for a while, which points to chronic compensation rather than something that started last week.
- Behaviour and willingness. Stiffness after standing, reluctance to go forward, a longer warm-up, new resistance under saddle. You know these horses and so do your riders. If one feels different, write it down rather than talking yourself out of it.
- Hoof and lower limb. Check hoof balance and shoe wear patterns for uneven loading, and take digital pulses on all four limbs before and after work.
What Are the Red Flags That Require a Vet Call?
| What you observe | What it may indicate | Action |
| Heat or swelling over a joint | Active joint inflammation or effusion | Call the vet |
| Short-striding persisting more than a few days | Joint pain the horse is compensating for | Call the vet |
| Reluctance or pain on flexion | Joint or soft tissue involvement in that limb | Call the vet |
| Asymmetric muscle loss over hindquarters or shoulders | Chronic compensation for an ongoing problem | Call the vet |
| Increased or bounding digital pulse | Inflammation in the lower limb or foot | Call the vet |
| New resistance or reduced willingness in work | Discomfort the horse cannot yet show as lameness | Monitor and record; call the vet if it persists beyond a week |
| Stiffness after standing that clears with work | Early joint change | Monitor and record; raise at the next vet visit |
The threshold is simple. If you find two or more flags in the same limb, book the vet. Do not give it a fortnight to settle on its own.
When Should You Call the Vet, and What Will They Assess?
If your check raises a flag, the vet visit is not optional. Early diagnosis is what keeps your options open, because the treatments available for a joint caught early are not the same as those available for a joint that has been compensating for months.
The vet can do three things you cannot: run a standardised flexion test and interpret it, use diagnostic analgesia to localise the pain to a specific structure, and image the joint with radiographs or ultrasound. What they are working towards is confirmation of whether a joint is involved, which one, and how far it has progressed. That visit is also worth having on file as a baseline, so that if a horse goes wrong in February you can compare against a documented assessment rather than memory.
On timing, leave at least six to eight weeks between the check and the start of your season. If treatment is required, most intra-articular approaches involve a short rest period, a graded return to work, and a review appointment, and you want that behind you before the real work starts.
What Are the Options If the Vet Finds Joint Involvement?
A joint issue found pre-season is not automatically a lost season. Options run from conservative management through to intra-articular treatment, and finding it early is what gives you the choice.
Conservative management. For mild or early changes, adjusted workload, surface management, farriery and close monitoring may be enough. Your vet will tell you whether that is realistic or whether it is deferring the problem.
Intra-articular corticosteroids. The conventional option. They act quickly to reduce joint inflammation, which suits a horse that needs to be right in short order. The trade-offs are duration of effect and the question of repeated dosing in the same joint, which your vet will weigh case by case. Detection and withholding requirements apply and are set by your racing or competition authority, so confirm the current position for your code before treatment.
Arthramid (2.5% iPAAG). A hydrogel of sterile water and cross-linked polyacrylamide, containing no active pharmaceutical. It is administered into the joint by a veterinarian and integrates into the synovial membrane over roughly 14 days, supporting joint function rather than masking pain. Because the effect builds gradually, it suits planning rather than rescuing.
In a double-blinded positive control study of 33 flat-racing Thoroughbreds with lameness localised to the middle carpal joint, 83.3% of horses treated with 2.5% iPAAG had resolved lameness at six weeks, compared with 27.3% treated with triamcinolone acetonide and 40% treated with sodium hyaluronate (de Clifford et al., 2021). In a separate international multicentre study of 43 horses with osteoarthritis in a single joint, 82.5% were non-lame at 24 months following a single injection (Tnibar et al., 2015).
The timeline fits pre-season preparation. Vets typically rest the horse for around 48 hours, keep it in reduced-impact work for up to two weeks while the gel integrates, then reassess at four to six weeks and top up if the response has been partial. Started eight weeks out, that sequence finishes before your horse is asked to do anything serious.
If your pre-season check has raised a concern, the next conversation is with your vet. Talk to your vet about Arthramid, or read a trainer’s experience with 2.5% iPAAG.
How Do You Protect Joint Health Across the Full Season?
Soundness is not a one-off check. The pre-season assessment sets your baseline. Repeating it and managing training sensibly is what protects it.
- Repeat the check monthly, and again after any heavy block of racing or competition. It takes ten minutes a horse and it is the only reliable way to catch drift from the baseline.
- Hold the line on warm-up and cool-down. Joints loaded at speed without preparation carry more risk. Build it into the programme rather than leaving it to the rider’s judgement on the day.
- Watch the going. Hard, uneven and deep surfaces all change how joints are loaded. Track the surfaces your horses work on the way you track the work itself.
- Do not wait for lameness to re-engage the vet. Stiffness, a change in attitude, or a performance dip you cannot explain are earlier and more useful signals than a visible head nod.
- Mid-season is not too late. If a joint issue emerges once the season is underway, the same options remain available, and your vet can advise on how treatment fits around your targets.
